// Copyright (c) 2017 VMware, Inc. All Rights Reserved.
//
// This product is licensed to you under the Apache License, Version 2.0 (the "License").
// You may not use this product except in compliance with the License.
//
// This product may include a number of subcomponents with separate copyright notices and
// license terms. Your use of these subcomponents is subject to the terms and conditions
// of the subcomponent's license, as noted in the LICENSE file.

package photon

import (
	"bytes"
	"encoding/json"
)

// Contains functionality for routers API.
type RoutersAPI struct {
	client *Client
}

// Options for GetSubnets API.
type SubnetGetOptions struct {
	Name string `urlParam:"name"`
}

var routerUrl string = rootUrl + "/routers/"

// Gets a router with the specified ID.
func (api *RoutersAPI) Get(id string) (router *Router, err error) {
	res, err := api.client.restClient.Get(api.client.Endpoint+routerUrl+id, api.client.options.TokenOptions)
	if err != nil {
		return
	}
	defer res.Body.Close()
	res, err = getError(res)
	if err != nil {
		return
	}
	var result Router
	err = json.NewDecoder(res.Body).Decode(&result)
	return &result, nil
}

// Updates router's attributes.
func (api *RoutersAPI) UpdateRouter(id string, routerSpec *RouterUpdateSpec) (task *Task, err error) {
	body, err := json.Marshal(routerSpec)
	if err != nil {
		return
	}

	res, err := api.client.restClient.Patch(
		api.client.Endpoint+routerUrl+id,
		"application/json",
		bytes.NewReader(body),
		api.client.options.TokenOptions)
	if err != nil {
		return
	}

	defer res.Body.Close()
	task, err = getTask(getError(res))
	return
}

// Deletes a router with specified ID.
func (api *RoutersAPI) Delete(routerID string) (task *Task, err error) {
	res, err := api.client.restClient.Delete(api.client.Endpoint+routerUrl+routerID, api.client.options.TokenOptions)
	if err != nil {
		return
	}

	defer res.Body.Close()
	task, err = getTask(getError(res))
	return
}

// Creates a subnet on the specified router.
func (api *RoutersAPI) CreateSubnet(routerID string, spec *SubnetCreateSpec) (task *Task, err error) {
	body, err := json.Marshal(spec)
	if err != nil {
		return
	}
	res, err := api.client.restClient.Post(
		api.client.Endpoint+routerUrl+routerID+"/subnets",
		"application/json",
		bytes.NewReader(body),
		api.client.options.TokenOptions)
	if err != nil {
		return
	}
	defer res.Body.Close()
	task, err = getTask(getError(res))
	return
}

// Gets subnets for router with the specified ID, using options to filter the results.
// If options is nil, no filtering will occur.
func (api *RoutersAPI) GetSubnets(routerID string, options *SubnetGetOptions) (result *Subnets, err error) {
	uri := api.client.Endpoint + routerUrl + routerID + "/subnets"
	if options != nil {
		uri += getQueryString(options)
	}
	res, err := api.client.restClient.GetList(api.client.Endpoint, uri, api.client.options.TokenOptions)
	if err != nil {
		return
	}

	result = &Subnets{}
	err = json.Unmarshal(res, result)
	return
}